/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.flink.ml.data;

import java.io.Closeable;
import java.io.IOException;

/**
 * date exchange read record interface.
 */
public interface RecordReader extends Closeable {
	/**
	 * no blocking read function.
	 * @return
	 * @throws IOException
	 */
	byte[] tryRead() throws IOException;

	/**
	 * @return true: read reach end; false: read not reach end.
	 */
	boolean isReachEOF();

	/**
	 * blocking read function.
	 * @return read byte[].
	 * @throws IOException
	 */
	byte[] read() throws IOException;
}
